Justin Bieber's name was nowhere to be found when the nominations for the 2013 Grammy Awards were announced.

And Bieber admits in an interview airing tomorrow on "Ellen" that not being nominated at all despite the critical and commercial success of his latest album, Believe, was definitely "a big bummer."

"I was looking forward to [possible Grammy noms], but I know it will happen one day," says the platinum-selling heartthrob, who was up for Best New Artist and Best Pop Vocal Album two years ago but lost out to jazz artist Esperanza Spalding and Lady Gaga, respectively.

"I'm so young, I'm only 18," he adds. "I'm just blessed to be able to do what I love every day. And the AMAs was a lot of fun for me so...Hopefully, one day."

Of course the American Music Awards were fun for Bieber--he won three trophies, including Artist of the Year!

And Ellen had to ask how it came about that Bieber was wearing overalls (one strap undone, natch) when he met Canadian Prime Minister Stephen Harper last month, a fashion faux pas that caught him a lot of heat from the peanut gallery.